Brussels is set to issue new antitrust charges against Microsoft over concerns that the software giant is undermining rivals to its videoconferencing app Teams.

According to three people with knowledge of the move, the European Commission is pressing ahead with a formal charge sheet against the world’s most valuable listed tech company over concerns it is restricting competition in the sector.

Rivals are concerned that Microsoft will make Teams run more compatibly than rival apps with its own software. Another concern is the lack of data portability, which makes it difficult for existing Teams users to switch to alternatives.

The tech company has also faced complaints from European cloud computing providers that are concerned that Microsoft is abusing its dominant position in the sector to force users to buy its products and squashing competition from smaller start-ups in Europe.